1014 Su dung cdng cu Frontsim trong viec danh gia va lya chon md hinh dia ch5t bai chî u ;̂ ;̂ StT DUNG CONG CU FRONTSIM TRONG VIEC DANH GIA VA LUA CHON • • • • MO HINH DIA CHAT BA CHIEU CHO DOI TlTO[.]
1014 Su dung cdng cu Frontsim viec danh gia va lya chon md hinh dia ch5t bai chi^u^;_;^ StT DUNG CONG CU FRONTSIM TRONG VIEC DANH GIA VA LUA CHON • • • • MO HINH DIA CHAT BA CHIEU CHO DOI TlTONG MONG NUT NE: v i DU AP DUNG CHO MO HINH MONG M O RUBY, BE C U U LONG Duong T^n Da, Le Ngoc Chanh Cong ty Thdm dd - Khai thde Ddu TOM TAT Bdi todn xdy dimg md hinh dia chdt ba chieu (3D) cho via sdn phdm la mdt bdi todn da nghiem, nhdt la vdn ddi tugng phuc tgp nhu mdng nut ne, nin vlic ldm di cd the chgn lua md hinh phdn dnh trung thuc nhdt su bdt ddng nhdt dia chdt ciia via chua la mdt viec rdt quan trgng vd khd khdn FrontSim, mdt mddun m&i phdn mim Petrel la mdt cdng cu qua dp dung thuc ti cd the dugc coi la rdt hiru hiiu di thuc hiin cdng viec ndy Khdng nhirng vdy, nd cdn thi hiin mdt cdch hieu qud viec ddnh gid chdt lugng cdng dgan chuyin ddi ty li tru&c vdo giai dogn xdy dung md hinh khai thde Vi bdn chdt FrontSim la mdt cdng cu ddnh gid thiiy ddng luc cd thi chgy md phdng vd du bdo khai thac mdi trudmg "live oil" (dp sudt via cd thi thdp hon dp sudt bdo hda) v&i sd lugng d mgng rdt ldm (chinh Id tdng sd d mgng ciia md hinh dia chdt via chua -fine model hodc static model) cd thi len din vdi triiu d V&i nhirng lgi thi trin, su dung FrontSim cdn phdi tr& thdnh mdt bu&c bdt bugc cdng tdc md hinh hod via chira MODAU Phuong phap xay dung mo hinh dia chat (MHDC) via chua ba chiSu thuong dugc dung va c6 hieu qua nhat la phuong phap "dia ch4t xac su4t" hay Geostatistics (hoae Stochastic) Theo phuong phap thi se dan din nhilu lua chon cho kit qua (theo s6 realization) va theo xac suat co nhieu kha nang chon lua mo hinh g§n thuc tl hon Tuy nhien, de co the lua chon dugc mo hinh thi c§n phai ap dung ca hai phuong phap la phuong phap dgng va phuong phap tmh N I U chi dung phuang phap tinh thi se nhanh hon nhung kit qua lua chgn chua du tin cay (truang hgp truac nam 2000) Vi thi phai dung ca phuang phap dgng de danh gia dac trung thuy dgng luc hgc cua mo hinh thi moi co chinh xac cao Tuy nhien, vai doi tugng mong nut ne, nh4t la tu sau nam 2001 Idii b4t dSu Sll dung Petrel dl xay dung MHDC theo cac phuang phap "thi tich 16 r6ng hieu dung" (Net Pore Volume - NPV) va "doi pha huy dut gay" (Halo Fault - HF) thi cong cu danh gia dgng luc (tuc la Streamline simulation) chua dugc phat triln Petrel cho din 2003 - 2004 Vi ban chat dia chat cua mong la r4t phuc tap, nh4t la he thong dut gay va nut ne ma dac biet la su phan bo ciia chiing khong gian mong lam cho mo hinh dia chdt luon luon ham chiia cac sai so ngau nhien Vai phuang phap NPV thi viec xac dinh, chgn lira sir thay doi phii hgp cua rong, bl day hieu dung NTG (Net to Gross) theo chilu sau tu noc mong vai HF thi la viec lua chgn khoang each phat trien va lien kit niit ne tinh tu diit gay (dai pha huy) va gia tri rong lan nhat ciing nhu quan he rong - thSm la nhirng gia tri nhay cam mang tinh sai s6 tilm tang Vi vay, lam de chgn dugc MHDC Juygn tap bao cao Hdi nghj KHCN "30 nam Phu Viet Nam: Co' hdi mdi, thach thuc mdi" 1015 nhilu mo hinh ma cac dac trung thiiy dgng luc ciia cac gilng khoan phan anh dugc su phii hgp vai cac s6 lieu thuc tl thu via, khai thac, PVT, v.v Do chinh la nhiem vu ciia cong cu FrontSim Phong Cong nghe mo - CNM (PVEP) da ap dung lan dau tien cho mo hinh mong Ruby 2004 (den thai diem 2004, Cuu Long JOC va JVPC chua ap dung FrontSim) va thu dugc ket qua kha quan Hien nay, phong CNM dang ap dung cho mo hinh via chiia tr§m tich ciia Song Doc (Truong Son JOC) QUY TRiNH CONG NGHE XAY DUTVG MHDC Co so dii lieu can de xay dung MHDC 3D vit da dang bao gom: tai lieu dia chSt chung, tai lieu dia chan, tai lieu dia vat ly gieng khoan, tai lieu phan tinh miu loi va mun khoan, cac tai lieu thu via va khai thac, v.v Khae vai d6i tugng trim tich, mong granit co cac dac trung rieng biet nhu rong co the phan b6 dge theo he th6ng diit gay va khe mit sinh kem vai nhieu nguon goc phiic tap nhu kien tao, phong hoa, qua trinh ngugi lanh va CO riit, V.V Do do, qua trinh xay dimg MHDC cho ting chiia mong co mgt s6 dilm khae biet va qui trinh dugc the hien theo so khoi nhu sau (Hinh 1) Mo hinh cau true Mo hinh thong so Mo hinh tham Mo hinh d^ rong -^ Mo hinh NPV JL Mo hinh HF FRONTSIM Chuyen doi ty le FRONTSIM Mo hinh khai thac Hinh 1: Quy trinh cong nghe xay dinig MHDC cho tang chii'a mong GIOI THIEU FRONTSIM FrontSim la mgt cong cu mo phong via dua tren ca so ciia ham In va ham hien va cac khai niem ve Streamline va Front-tracking Trong Streamline la cong cu dai dien cho dong chay via va Front-tracking la cong cu diing dl giai phuang trinh bao hoa CO huong qua trinh xac dinh bao hoa FrontSim la mgt cong cu huu dung va 1016 Su dung cdng cu Frontsim viec danh gia va lu^ chon md hinh dja chat bai cliieu^ CO thi thuc hien cong viec danh gia nhanh MHDC va chuyin d6i ty le hay lam cong viec mo phong via mgt each day dii FrontSim mo phong dong chay nhilu pha dge theo cac duong dong Streamline Trong Eclipse mo phong dong chay giua cac mang mo hinh FrontSim chay nhanh hon va chay dugc voi MHDC (fine grid) vai ting mang Ion toi vai trieu Eclipse chi c6 the chay vai mo hinh sau chuyen d6i ty le (coarse grid) voi tdng mang CO nho hon 300.000 Chinh dac diem noi trgi nay, FrontSim dugc xem la cong cu hieu qua viec lua chgn mo hinh dia chat CQng can phai chii y rang, mgt so truang hgp neu MHDC qua lan (vai chuc trieu mang) hay co so dG lieu dau vao qua nhay cam, bien doi dai rgng thi FrontSim van CO the tieu ton nhieu thai gian neu chay tat ca cae kha nang DANH GIA VA LI/A CHON MO HINH Tieu chi chgn mo hinh dia chat dua tren cac thong so dau cua FrontSim Co hai tieu chi co ban de chgn mo hinh dia chat Thii nhat, chgn mo hinh dia chat nao cho thong so dau giai doan chay FrontSim gan voi so lieu quan sat nhat Thii hai, chgn mo hinh dia chat nao cho thong so dau a giai doan chay FrontSim ciia ca mo hinh dia chat truac va sau chuyen doi ty le phai tuong tu hoae gan nhat Thong so dau vao Viec danh gia va lira chgn mo hinh phu thuoc rat nhieu vao viec chgn cac thong so dau vao vi viec lira chgn cac thong so la giai doan quan trgng, quyet dinh tinh chinh xac cua mo hinh Doi voi via ma cac tinh chat ciia dat da va chat luu tucmg d6i ddng nhat, hoae bien doi mgt each tu tu thi viec chgn thong so it phiic tap Nguge lai, nlu tinh chit cua dit da va chat luu bien doi dot nggt a mgt khoang each nhit dinh nhu a d6i tugng mong nut ne, thi viec chgn thong so dau vao rat kho va phai hit siic cin than D6i vai nhung via mang tinh bat dong nhat cao thi dii cung phai chgn dugc cac thong s6 diu vao dam bao tinh dai dien cho mo hinh Cac thong so diu vao dugc liet ke nhu Bang a Thong sd rdng vd tham Phan bo ba chilu rong va thim dugc tao giai doan xay dung mo hinh dia chit Sir phan b6 ciia chiing mo hinh la viec kit hgp kit qua phan tich mau loi, minh giai dia vat liy gilng khoan (DVLGK), thii via va dia chin, dac biet la thuoc tinh dia chan Tuy nhien, thuc tl viec kit hgp tit ca cac du lieu hien co cung khong dii co so de loai bo tat ca nhung nii ro xay dung sir phan b6 ciia chiing khong gian mo, nhat la mong Phuang phap xay dung MHDC la giai bai toan da nghiem Do do, su phan bo rong va tham cGng co da nghiem iing vai moi nghiem rong va thim, FrontSim cho mgt ket qua b Cdc thong so khdc Ngoai hai thong so rdng va thim la hai thong so chinh viec lira chgn MHDC, tiiy vao muc dich nghien ciiu ma cac thong so khae ciing dong vai tro quylt dinh viec lira chgn mo hinh Cac thong s6 bao gom: - Thong s6 PVT ciia chit luu: Thi hien tinh chat ciia chat luu Tuygn tap bao cao Hgi nghj KHCN "30 nam Phu Viet Nam: Co' hdi mdi, thach thuc mdi" 1017 Thong s6 Rel Perm: Dung dl xay dijng su phan b6 bao hoa chat luu Ap suit ban diu ciia via: Thi hien dilu kien dgng luc ban dau cua via Ngoai ra, no cho bilt trang thai cua chat luu via d thdi diem ban dau Do nen ciia dit da: Do nen ciia dat da anh hudng true tiep den he sd thu hdi dau Ky hieu Ten ggi -e- Md td ddt da Md td chdt luu Md td ddt dd Md td chdt luu Md td ddt dd Md td chdt luu Thdng sd md td su thay ddi cua he thdng ddu - nu&c Thong sd md td su thay ddi cua he thdng ddu Thdng sd md td via & dieu kiin tinh (dieu kien ban ddu) Bang Do rong NTG Ty so Net-to-Gross Pi Ap suat ban dau Bo He so the tich cua dau Bw He sd he the tich cua niroc Bg He sd he the tich ciia Po Mat cua dau d dieu kien chuan pw Mat cua nude d dieu kien chuan pg Mat cua d dieu kien chuan Kx,Ky, Kz Do tham ciia dat da theo phuong x, y va z Kro, Krg theo So Do tham tuong ddi cua dau va ciia theo bao hda dau Cf Do nen cua dat da Rs theo P Ty sd hda tan theo ap suat Bo theo P He sd he the tich ciia dau theo ap suat Bo theo P He sd he the tich cua theo ap suat 1^0 theo P Do nhdt ciia dau theo ap suat l^g theo P Do nhdt ciia theo ap suat Co Do nen cua dau Uw Do nen ciia nude Krw, Kro theo Do tham tuong ddi ciia nude va dau theo bao hoa nude Pcwo theo Sw Ap suat mao dan ciia he thdng dau nude theo bao hoa nude Bw theo P He sd he cua nude theo ap suat l^w theo P Do nhdt cua nude theo ap suat 1018 Su dung cdng cu Frontsim viec danh gia va lu-a chon md hinh dja chht bai cliieu^ Thong so dau U'ng vdi cae thdng sd dau vao nhu tren thi FrontSim se cho cac thdng sd dau Thdng sd diu eiia FrontSim la luu lugng khai thac, dudng ap suit cua md va cua tung gilng theo thdi gian, he sd thu hdi dau, v.v Tuy vao muc dich nghien ciiu ma ngudi su dung cin tap tmng phan tich nhung thdng sd can thiet Cac thdng sd dau cua FrontSim dugc phan tich, sii dung viec lira chgn MHDC, danh gia phuong phap chuyen ddi ty le, hd trg History Matching, xac dinh su anh hudng ciia cac gieng bom ep va cua tang nude day Vdi su ho trg ciia FrontSim, cdng viec History Matching sii dung Eclipse dugc tien hanh dl dang va nhanh chdng hon Bing each thay ddi cac thdng sd via theo cac dudng Streamline nhu thim ching ban ma bing each cac thdng sd dugc dieu chinh dge theo dudng Streamline cho cae thdng sd diu ciia FrontSim gin vdi sd lieu quan sat nhat Mdt dac dilm khae ciia FrontSim la cho chiing ta bilt dugc sir anh hudng ciia cac gilng khai thac vdi nhau, su anh hudng ciia cac gilng bom ep va ciia ting nude day Thdng qua dd giiip cho viec xac dinh vi tri gilng khai thac, vi tri gilng bom ep mdt each nhanh chdng va tilt kiem dugc thdi gian giai doan chay Prediction cua md hinh khai thac v i DU AP DUNG FRONTSIM CHO MO HINH MONG RUBY 2004 Danh gia va lya chon Cac thdng sd khai thac, thii via va phan tich miu chit luu dugc trinh bay cac bang sau: Trgng lugng rieng Ddu (kg/m^) Nu&c (kg/m ) Khi (kg/m^) 538,85 957,51 0,856 Do nen ciia dat da (1/bar) Ap sudt (psi) Rj(l/psi) 1.50000E-05 4330 PVT ciia nude Ap sudt (psi) Bo Cwf /Av 4167 1,04758 3,50E-06 0,227802 Ap sudt (psi) Bo /^o 3916 1.744 0.188 4330 1,7 0.2 PVT of dau l u y g n j f p b a o cio Hdi nghj KHCN "30 nSm Phu Viet Nam: Co hQi mdi, thach thuc mdi" 1019 Dd tham tuong ddi Khi Ddu Nu&c Sw_min 0,15 Sw_cr 0,15 Corey nude krw(S),Sorw 0,3 krw(S),S=l 0,25 Sorw Corey O/W kro(S),Somax Sgcr 0,01 Corey Khi 5,2 krg(a>Swmin krg(a),Sorg 0,5 kro(S)Somax Do sau ranh gidi dau nude gia thiet: 3200mss (theo C Sander, 2004) ap suat via ban dau la 4330psi tai ranh gidi dau - nude Dd man cua mudi Do man cua mudi (PPM) Nhiet via 14000 716 Rs @Pb (SCF/STB) CR) 931 Sd lieu khai thae Giing Ngdy bdt ddu LuTi lugng Ap sudt gi&i hgn (psi) RB-4P 12-11-1998 1800 1000 RB-6PST 20-4-2005 2000 1000 Bieu dd san lugng khai thac dugc trinh bay hinh ve sau: '-.»«*^»oo» i-J»n-20oi loor^ i-j>v4'ZDio -Well RB-4P i-jAM-aoiz ^.JMt*.20^.* i-j^,M-2sie -Vi/ell e P S T _ Hinh 2: Ket qua chay FrontSim-Trutmg hop MLI i.jAM-30ie t-j^n-ioro Su dung cdng cu Frontsim viec danh gia va lira chon md hinh dja chat bai chieu 1020 Hinh 3: Ket qua chay FrontSim-Tru'dug hgp ML2 o i l p r o d u e c t a r t r a « * Pr>i_,n^tn_Z Hinh 4: Ket qua chay FrontSim-Truong hop Min 4.200a t-JAM-2t>04 114 1-JAM-20ie 10Af4-20(( I SRI I- f a- r ^ã>ôI3 w e l l FS;B-4P \A/en ^-J**^-30^^ toPST_2 [ Hinh 5: Ket qua chay FrontSim-Trudug hop Min 102: Jl^}^n_t|pbao cio Hpi nghj KHCN "30 nam Phu Viet Nam: Co' hoi mdi, thach thuc mdi , J^ — t , -,.™ l.J*W4.TOO- J A M aoua o i l p r e < a u « T l o n r a t * Pt^i .JUMN-XDO* t.J:*i»4-«»* t-jAM-anio maxl_„3 l.JrtN-Mta J ATI-apt l-JAN-ZDIn , >-,.ằ , u,ô,ô, ãII S'' ã^ S3 ã ll- , , — 1.B- B' •' •' ,.9- J i ô ô ) i i-jftv^aoDo ^'Jf^4-ã3lOoa I'^AHMRU* ãjAM-^i>oô t-Jô^ããltc)t>ô I'jAt^aviO l-JM^^>i>i> - 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""i^JiS^li^'iV -WWtl MI!I-*tP' CjiiiX:ii*iA ~ r - ^ M / « M r« ~ ' ~" t j M M r « ( > » •'•1^4-MkO -WWII 0P»WT„» Hinh 7: Kit qui ch^y FrontSim-Tryimg h9p Max2 VJ M4.I.M o»»-.*no« - -W.««)» 1'.iMM'ifiMia WWII n M - F t iiMi.H)nM oil |»r«(iuaMon «umul««iv* i.,u*N.*i>rtH t-jAMiniii i.jnttanif i.JHtifni* i.jA»«itnii> J ^, a * • » • 1• iJ: 1 -rr:rrr^i^:^'';^^^-^-~= - ' ••' • ' J ^ ' " ' * * ' ^^M^.mvm» p*''*i.- rwiL.i a 4'J'rJ.AIMH - t"hL_MLa,a t.Jml-MMm I.^.Mi.MIWô .lA^'ttDIU **'''^'ằ"^',p,^,Mi^,,;.Tv::.fl'!^i,B^'i^'!'?'Jjii'-!' 4-.>Mf4Ot> ã.JM4.,OI* :_J;^""-i""***^-^ Hinh 8: Sdn lu^ng d4u c$ng d6n I-.1ô^Iô(ô " P**^'-.'""''s> 'ã-'ãã'"ãằã" Su- dung cdng cu Frontsim viec danh gia va lu-a chon md hinh dia chat bai chigu 1022 f:|9lcl O i l |>roclMC«lor» roto t-.^-*«'ao«* CE Hinh 9: Lini lu9'ng khai thac tru^c va sau chuyen doi ty If OH p r o d u c t t o n r a f * RB_B_fW1L^.S-TP I I I f • •5 r -VA^ell F?B-aP F=^==^^^^^ Wgll P S T _ XA'Hll P Hinh 10: Ket qua chay FontSim \&\ RBB-3P va 4P-Tru-6Tig h9p ML O H p r o d u e t t o n rart» R B _ B _ f r t l _ B - P •4-3oia i i.jAM-mi* i I ^' !• Sa )-.Mwit e P T _ ^ |.JjM4-MWr Well 7P 'i-uAt^itttio u**i»il - W n l i 10P Hinh 14: Kit qua ch^y FontSim v